US4199949A - Hydraulic master cylinder - Google Patents

Hydraulic master cylinder Download PDF

Info

Publication number
US4199949A
US4199949A US05/841,785 US84178577A US4199949A US 4199949 A US4199949 A US 4199949A US 84178577 A US84178577 A US 84178577A US 4199949 A US4199949 A US 4199949A
Authority
US
United States
Prior art keywords
piston
ring
pressure chamber
master cylinder
shoulder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/841,785
Other languages
English (en)
Inventor
Leonardo Cadeddu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Benditalia SpA
Original Assignee
Benditalia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IT2835676A external-priority patent/IT1073050B/it
Priority claimed from IT2562677A external-priority patent/IT1076095B/it
Application filed by Benditalia SpA filed Critical Benditalia SpA
Application granted granted Critical
Publication of US4199949A publication Critical patent/US4199949A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/232—Recuperation valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • F16J15/3276—Mounting of sealing rings with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/141—Check valves with flexible valve members the closure elements not being fixed to the valve body
    • F16K15/142—Check valves with flexible valve members the closure elements not being fixed to the valve body the closure elements being shaped as solids of revolution, e.g. toroidal or cylindrical rings

Definitions

  • the present invention relates to a hydraulic master cylinder, in particular for controlling actuation of braking circuit of a motor vehicle.
  • a hydraulic master-cylinder has already been proposed having a housing defining a bore therewithin, inside which is disposed a piston which separates the bore into a supply chamber connected to a fluid reservoir, and a pressure chamber connected to a utilization circuit.
  • the piston of this master cylinder has a radial shoulder which cooperates with an annular ring, generally of elastomeric material to establish a valve which prevents fluid communication between the supply chamber and the pressure chamber during actuation of the piston, while allowing limited communication during the return stroke of the piston when a further supply of liquid in the pressure chamber is required, resulting from a leakage made in the utilisation circuit, or from a bleeding operation of this circuit.
  • the hydraulic master cylinder comprises a housing having a bore therewithin.
  • a piston which is slidably mounted in the bore, separates a supply chamber adapted to be communicated to a fluid reservoir from a pressure chamber adapted to be communicated with a hydraulic utilization device.
  • the piston has a head adjacent the pressure chamber with a radial shoulder thereon.
  • a valve formed by an elastomeric annular ring is mounted on the piston head.
  • the annular ring has a predetermined amount of radial play with respect to the radial shoulder on the piston and a stop.
  • the annular ring engages the radial shoulder to control fluid communication between the supply chamber and the pressure chamber, such communication being allowed when the piston occupies its rest position and being normally interrupted when the piston is moved from its rest position.
  • the ring has an annular resilient lip projecting therefrom toward the radial shoulder to define a non return valve which prevents fluid flow from the pressure chamber toward the supply chamber when the piston occupies a position away from its rest position.
  • FIG. 1 is a sectional view of a hydraulic master cylinder made according to the invention, said master cylinder being illustrated in its rest position;
  • FIG. 2 is an enlarged view of the portion limited by dotted line 2 of the master cylinder illustrated in FIG. 1, showing the respective positions of various elements of the master-cylinder when the latter occupies its rest position;
  • FIG. 3 is an enlarged view of the portion limited by dotted line 2 of the master-cylinder illustrated in FIG. 1, showing the respective positions of various elements of the master cylinder when the latter is operated during the forward stroke of the piston;
  • FIG. 4 is an enlarged view of the portion limited by dotted line 2 of the master cylinder illustrated in FIG. 1 showing the respective positions of various elements of the master cylinder, corresponding to a fluid supply phase during the return stroke of the piston;
  • FIG. 5 is a sectional view of a second embodiment of a hydraulic master cylinder made according to the invention, said master cylinder being illustrated in its rest position;
  • FIG. 6 is an enlarged view of the portion limited by dotted line 6, of the master cylinder illustrated in FIG. 5.
  • reference 10 designates a hydraulic master cylinder which is adapted to be used in the braking circuit of an automotive vehicle.
  • the master cylinder 10 comprises a housing 12 with a bore 14 defined therewithin.
  • a piston 16 is slidably mounted in bore 14 and is adapted to separate the bore 14 into a supply chamber 18 in communication with a fluid reservoir (not shown in the drawings) and into a pressure chamber 24 in communication, by way of an outlet orifice 32, with a utilization device which is constituted here by at least one brake actuator (not shown) associated with the vehicle wheels.
  • the supply chamber 18 is formed by a longitudinal slot 19 provided in the piston 16 and the annular space defined between the housing bore 14 and a first reduced diameter portion of the piston.
  • This annular space partly overlaps the longitudinal slot 19 and is limited by a first radial shoulder 26 situated in a plane intersecting the longitudinal slot 19.
  • the longitudinal slot communicates with a fluid reservoir by means of a passage 21 in extension 20 of a refill plug screwed in a lateral orifice of the housing 12.
  • the face of piston 16 adjacent to the pressure chamber 24 as best shown in FIGS. 1 and 3 comprises in this order the first radial shoulder 26, a cylindrical surface 28 having a diameter d 1 smaller than the diameter of the bore 14, and a second shoulder 30 adjacent to cylindrical surface 28.
  • a rigid spacer ring 34 is slidably disposed in the annular space which has been previously defined. However, there is provided some play between ring 34 and piston 16, to permit free fluid communication between the supply chamber 18 and the pressure chamber 24.
  • Piston 16 also comprises a head 40 having a reduced diameter with respect to that of cylindrical surface 28. Head 40 projects from the surface defined by radial shoulder 30, toward the pressure chamber 24.
  • An annular ring 42 made of elastomeric material is mounted adjacent the spacer ring 34, in the pressure chamber. Ring 42 respectively comprises a first and a second plane lateral faces 41 and 43 which respectively face the supply chamber 18 and the pressure chamber 24.
  • the first lateral face 41 later termed contacting face, is adapted to come into contact against shoulder 30 of piston 16 to interrupt fluid communication between the supply chamber 18 and the pressure chamber 24.
  • a lip 54 is associated to ring 42 such as to be disposed adjacent to the inner portion of the ring and projecting from the lateral face 41 toward the shoulder 30.
  • the lip 54 is integral (by moulding for instance) with ring 42, but such a construction is not compulsory, and the lip 54 could as well be made of a material different from that of the ring 42.
  • Lip 54 is adapted to cooperate with shoulder 30 so as to define a non-return valve when the piston is out of its rest position. As can be seen in FIG. 2, lip 54, in its non-deformed position is turned down towards the axial center of the elastomeric ring 42 and its free extremity 55 projects toward shoulder 30, beyond contacting face 41.
  • a return spring 44 urges piston 16 towards its rest position by way of a cup 46, abutting a shoulder 60 provided at the vicinity of the free end of head 40.
  • Another spring 48 having one end abutting cup 46, urges ring 42 in the direction of radial shoulder 30, by means of a rigid disc 50, abutting against the other lateral radial face 43 of ring 42.
  • the head 40 also comprises another shoulder 62 to limit the movement of the rigid disc 50 in the direction of shoulder 30, so that, when the piston is displaced out of its rest position, the axial distance which separates the right end face of the disc 50 and shoulder 30 is slightly larger than the axial distance between lateral faces 41 and 43.
  • the difference between these two distances determines an axial play which is smaller than the maximal distance between the free end of lip 54 and the plane of the lateral contacting face 41, when the lip 54 occupies its non deformed position. Therefore, under normal operative conditions of the master cylinder, the free extremity of lip 54 is in sealing contact with shoulder 30.
  • FIG. 2 of the drawings it should be noted that the spacer ring 34 abuts the end of plug 20 which penetrates into chamber 18.
  • the piston 16 is repelled to the maximum to the right, when considering the drawings, under the action of spring 44, whereas ring 42 is now in contact with abutment ring 34. Accordingly, there is created a space between contacting face 41 of ring 42 and shoulder 30, so that fluid communication is free between the supply chamber 18 and the pressure chamber 24.
  • the axial length of ring 34 is sufficient to disengage the contacting face 41 and the free extremity 55 of lip 54, from shoulder 30.
  • FIG. 3 shows the relative positions of various elements of the master cylinder during actuation of the brakes corresponding to a forward stroke of piston 16.
  • the piston 16 moves toward the left so that the radial shoulder 30 comes into contact against the contacting face 41 of ring 42 to interrupt fluid communication between the supply chamber 18 and the pressure chamber 24.
  • ring 42 moves together with piston 16 to compress the fluid contained in the pressure chamber 24.
  • the axial distance "e" between shoulder 26 and shoulder 30, is preferably equal to the axial length of ring 34, so that during the compression phase, the peripheral portion of the elastomeric ring 42 is also supported by the spacer ring 34.
  • distance "e” must be equal to or smaller than the axial length of the spacer ring 34, in order to avoid a parasitic separation of the elastomeric ring 42, from the shoulder 30.
  • lip 54 bearing on shoulder 30 and urged against the latter by the pressure prevailing in pressure chamber 24.
  • this pressure presses the ring 42 against the internal surface of the housing to insure a good peripheral tightness, even in case of slight deterioration of the outer surface of said ring.
  • the check valve 54 created by the lip guarantees fluid tightness between the pressure chamber 24 and the supply chamber 18 even in the presence of significant friction force between the outer periphery of the ring 42 and the inner wall of the bore 14 which tends to separate the ring 42 from the shoulder 30 before the end of the return stroke of the piston.
  • the fluid tightness between the pressure chamber 24 and the supply chamber 18 is guaranteed by the lip 54 which remains in contact with shoulder 30, avoiding a sharp decrease of the pressure prevailing in the pressure chamber and also avoiding a dangerous increase of the lost motion of the piston in the case of successive and relatively short actuations by the driver.
  • FIG. 4 shows the relative positions of various elements of the master cylinder during a supply phase corresponding to the return stroke of the piston 16, in pressure chamber 24.
  • piston 16 which has not yet reached its rest position shown at FIG. 2, moves to the right under the influence of spring 44, whereas ring 42 is urged by spring 48 and rigid ring 50.
  • Lip 54 is thereby resiliently deformed under the influence of the pressure difference between the supply chamber 18 and the pressure chamber 24, to allow fluid supply toward the pressure chamber. This pressure decrease phenomenon occurs, for instance, in the event that the fluid which returns from the brake actuators is delayed, or also by reason of leakage in the utilization circuit or following a bleeding operation.
  • reference 110 designates a master-cylinder having a housing 112 which has a bore 114 therewithin.
  • a piston 116 is slidably mounted in the bore 114.
  • Piston 116 separates the bore 114, in a usual manner, into an annular space 118 and a pressure chamber 124.
  • the master-cylinder also comprises a nipple 122 adapted to be connected to a fluid reservoir.
  • the annular space 118 is also permanently connected to the nipple 122 by a radial orifice 111.
  • the pressure chamber 124 is connected to at least a brake actuator (not shown) by means of an outlet orifice 132.
  • the piston head 150 separates the annular space or supply chamber 118 from the pressure chamber 124.
  • annular groove 113 in piston 116 adjacent head 150 retains an annular ring 142.
  • the annular ring 142 is mounted with axial clearance, and is adapted to cooperate in a known manner, with a compensation orifice 115 connected to the fluid reservoir (not shown), to control fluid communication between said reservoir and the pressure chamber 124, during movement of the piston 116.
  • piston 116 is urged into its rest position by a spring 144 which is disposed in the pressure chamber 124, and which abuts against the end face of the latter.
  • the piston stroke toward the right is limited by stop means 117 formed by retainer maintained in the housing bore by a snap ring 119.
  • groove 113 has radial faces 121 and 123.
  • Radial face 121 defines a shoulder which is slightly kept away from the facing contacting face 143 of ring 142, when the piston occupies its rest position.
  • Radial face 123 defines a stop against which radial face 145 of ring 142, comes into contact.
  • a lip 154 which axially projects from the inner diameter portion 153 of ring 142 comes into contact with radial shoulder 121, to cooperate with the latter to define a non return valve permitting fluid supply to the pressure chamber 124 but preventing fluid flow from the pressure chamber 124 toward annular space or supply chamber 118, when the piston 116 is moved out of its rest position.
  • the lip 154 is deformed under the influence of the pressure difference which has been created between the supply chamber 118 and the pressure chamber 124, so as to permit further fluid supply of the pressure chamber.
  • each piston of the master-cylinder would be equipped with a ring comprising a lip.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
US05/841,785 1976-10-15 1977-10-13 Hydraulic master cylinder Expired - Lifetime US4199949A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT28356A/76 1976-10-15
IT2835676A IT1073050B (it) 1976-10-15 1976-10-15 Cilindro maestro idraulico per impianti di frenatura di veicoli
IT25626A/77 1977-07-12
IT2562677A IT1076095B (it) 1977-07-12 1977-07-12 Cilindro maestro idraulico per impianti di frenatura di veicoli

Publications (1)

Publication Number Publication Date
US4199949A true US4199949A (en) 1980-04-29

Family

ID=26328609

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/841,785 Expired - Lifetime US4199949A (en) 1976-10-15 1977-10-13 Hydraulic master cylinder

Country Status (10)

Country Link
US (1) US4199949A (ja)
JP (1) JPS5858264B2 (ja)
AR (1) AR212129A1 (ja)
BR (1) BR7706799A (ja)
DE (1) DE2746260A1 (ja)
ES (1) ES463229A1 (ja)
FR (1) FR2367639A1 (ja)
GB (1) GB1539690A (ja)
SE (1) SE421399B (ja)
YU (1) YU40681B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295336A (en) * 1980-02-05 1981-10-20 Wagner Electric Corporation Master cylinder assembly with detachable reservoir
US4479506A (en) * 1982-08-09 1984-10-30 Baker Cac, Inc. Conduit blowout preventer
US4745751A (en) * 1987-02-03 1988-05-24 Allied Corporation Master cylinder with fast fill valving mechanism
US6220188B1 (en) * 1996-09-09 2001-04-24 Burmeister & Wain Energi A/S Windbox burner
EP1867887A1 (en) * 1999-02-09 2007-12-19 Latchtool Group, LLC A compact, resistance regulated, multiple output hydraulic package and seal valve arrangement
US20120080097A1 (en) * 2010-10-01 2012-04-05 Globe Union Industrial Corp. Air intake module of water feeding apparatus
GB2551532A (en) * 2016-06-21 2017-12-27 Ap Racing Ltd A hydraulic master cylinder, a vehicle braking system and a vehicle

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008863B1 (en) * 1978-08-31 1982-01-27 Automotive Products Public Limited Company Hydraulic master cylinder
IT1129546B (it) * 1980-01-17 1986-06-04 Benditalia Spa Cilindro maestro,particolarmente per impianti di frenatura per autoveicoli
JPS5887660U (ja) * 1981-12-09 1983-06-14 株式会社ナブコ マスタシリンダ
DE3214047A1 (de) * 1982-03-18 1983-11-03 FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt Hauptbremszylinder
DE3405967A1 (de) * 1984-02-18 1985-08-22 Alfred Teves Gmbh, 6000 Frankfurt Hydraulische bremsanlage mit schlupfregelung
DE3533731A1 (de) * 1985-09-21 1987-03-26 Teves Gmbh Alfred Dichtungsanordnung fuer eine kolben-zylindereinheit
GB2183756B (en) * 1985-11-26 1988-12-14 Automotive Products Plc Hydraulic master cylinder
US5535590A (en) * 1995-04-06 1996-07-16 General Motors Corporation Master cylinder with applied brake compensation capability
EP0850814B1 (en) * 1996-12-26 2003-09-17 BOSCH BRAKING SYSTEMS Co., Ltd. Master cylinder having double structured seal ring
DE19710869A1 (de) * 1997-03-15 1998-09-17 Schaeffler Waelzlager Ohg Dichtsitz für ein hydraulisches Schaltelement in einem Einbauraum, insbesondere für ein direkt gesteuertes Cartridge-Ventil in einer Einsteckbohrung
DE19850560B4 (de) * 1998-11-03 2010-04-01 Zf Sachs Ag Geberzylinder für eine hydraulische Anlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1109715A (fr) * 1953-10-14 1956-02-01 Teves Gmbh Alfred Maître-cylindre pour freins hydrauliques, notamment pour véhicules automobiles
US3165896A (en) * 1962-12-15 1965-01-19 Fiat Spa Hydraulic brake
GB985098A (en) * 1961-03-02 1965-03-03 Heinz Teves Improvements in or relating to hydraulic master cylinders
US3264006A (en) * 1965-04-23 1966-08-02 Fmc Corp Anti-dust ring
US3300973A (en) * 1964-07-22 1967-01-31 Fiat Spa Master cylinder
US3800541A (en) * 1972-09-12 1974-04-02 Caterpillar Tractor Co Brake master cylinder cup seal with valve

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766431A (en) * 1953-02-11 1957-01-23 Nat Res Dev Improvements relating to hypodermic injection apparatus
FR1157216A (fr) * 1955-08-25 1958-05-28 Stabeg Appbau Gmbh Garniture de piston actionné pneumatiquement ou hydrauliquement
FR1309764A (fr) * 1961-01-11 1962-11-16 Fiat Spa Pompe pour liquides, notamment maître-cylindre pour installations de freinage hydraulique de véhicules automobiles
FR1324762A (fr) * 1961-06-09 1963-04-19 Dunlop Sa Perfectionnements aux maîtres-cylindres, notamment pour véhicules automobiles
FR1390254A (fr) * 1962-12-15 1965-02-26 Fiat Spa Dispositif générateur de fluide sous pression propre à être utilisé pour la commande d'installations de freinage hydraulique équipant notamment les véhicules à moteurs
FR1440394A (fr) * 1964-07-22 1966-05-27 Fiat Spa Améliorations aux maîtres-cylindres plus particulièrement pour les mécanismes de frein hydraulique des véhicules automobiles
US3490232A (en) * 1966-08-11 1970-01-20 Philip Sidney Baldwin Seal,particularly for a piston in the master cylinder of a hydraulic brake system
DE1680211A1 (de) * 1967-03-13 1971-04-15 Pares Ruiz De Morales Hydraulische Kolbenpumpe
DE1902235A1 (de) * 1969-01-17 1970-07-23 Mueller Hermann E Fa Rueckschlagventil fuer hydraulische Druckgeber
GB1388056A (en) * 1972-06-13 1975-03-19 Gits Bros Mfg Co Circumferential seals
DE2246390A1 (de) * 1972-09-21 1974-03-28 Teves Gmbh Alfred Lippendichtung zur abdichtung eines axial beweglichen kolbens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1109715A (fr) * 1953-10-14 1956-02-01 Teves Gmbh Alfred Maître-cylindre pour freins hydrauliques, notamment pour véhicules automobiles
GB985098A (en) * 1961-03-02 1965-03-03 Heinz Teves Improvements in or relating to hydraulic master cylinders
US3165896A (en) * 1962-12-15 1965-01-19 Fiat Spa Hydraulic brake
US3300973A (en) * 1964-07-22 1967-01-31 Fiat Spa Master cylinder
US3264006A (en) * 1965-04-23 1966-08-02 Fmc Corp Anti-dust ring
US3800541A (en) * 1972-09-12 1974-04-02 Caterpillar Tractor Co Brake master cylinder cup seal with valve

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295336A (en) * 1980-02-05 1981-10-20 Wagner Electric Corporation Master cylinder assembly with detachable reservoir
US4479506A (en) * 1982-08-09 1984-10-30 Baker Cac, Inc. Conduit blowout preventer
US4745751A (en) * 1987-02-03 1988-05-24 Allied Corporation Master cylinder with fast fill valving mechanism
US6220188B1 (en) * 1996-09-09 2001-04-24 Burmeister & Wain Energi A/S Windbox burner
EP1867887A1 (en) * 1999-02-09 2007-12-19 Latchtool Group, LLC A compact, resistance regulated, multiple output hydraulic package and seal valve arrangement
US20120080097A1 (en) * 2010-10-01 2012-04-05 Globe Union Industrial Corp. Air intake module of water feeding apparatus
US8459304B2 (en) * 2010-10-01 2013-06-11 Globe Union Industrial Corp. Air intake module of water feeding apparatus
GB2551532A (en) * 2016-06-21 2017-12-27 Ap Racing Ltd A hydraulic master cylinder, a vehicle braking system and a vehicle
US11203329B2 (en) 2016-06-21 2021-12-21 Ap Racing Limited Hydraulic master cylinder, a vehicle braking system and a vehicle
GB2551532B (en) * 2016-06-21 2022-02-09 Ap Racing Ltd A hydraulic master cylinder, a vehicle braking system and a vehicle

Also Published As

Publication number Publication date
DE2746260A1 (de) 1978-04-20
AR212129A1 (es) 1978-05-15
JPS5858264B2 (ja) 1983-12-24
FR2367639B1 (ja) 1981-07-24
ES463229A1 (es) 1979-06-01
JPS5349677A (en) 1978-05-06
GB1539690A (en) 1979-01-31
FR2367639A1 (fr) 1978-05-12
BR7706799A (pt) 1978-07-11
YU40681B (en) 1986-04-30
DE2746260C2 (ja) 1987-08-06
SE7711555L (sv) 1978-04-16
SE421399B (sv) 1981-12-21
YU246477A (en) 1982-05-31

Similar Documents

Publication Publication Date Title
US4199949A (en) Hydraulic master cylinder
US4133178A (en) Quick take-up master cylinder
US4086770A (en) Dual circuit quick take-up master cylinder
US4492082A (en) Master cylinder for hydraulically actuated brakes for automotive vehicles
EP0219834B1 (en) Portless type master cylinder device with non return valve and restricted passage in parallel between pressure chamber and fluid reservoir
US5735188A (en) External slave cylinder for hydraulic clutch release system
US4042072A (en) Piston-cylinder unit for use in a disc brake assembly
US4099380A (en) Master-cylinder for hydraulic booster
US4414811A (en) Master cylinder
JPS625821B2 (ja)
JP2000508414A (ja) 環状密封部材
US4802559A (en) Hydropneumatic brake actuator arranged to maintain a constant brake shoe clearance
US3488959A (en) Dual master cylinder
US4220007A (en) Servo-assisted hydraulic master cylinder
JPS6220934B2 (ja)
US5359854A (en) Actuating unit for hydraulic brake system
US6065292A (en) Master cylinder
US4318272A (en) Brake force amplifier
US5647213A (en) Master cylinder with quickfill stage
KR20000064689A (ko) 주브레이크실린더
EP0112009B1 (en) A master cylinder assembly for a vehicle hydraulic braking system
US3977193A (en) Hydraulic braking force multiplying device
US3733106A (en) Combination valve assembly with proportioner override
US4103593A (en) Hydraulic brake booster and shield therefor
US4386807A (en) Pressure regulating valve for hydraulic brake systems